Thiel is a true believer in Jesus and God. He was raised evangelical. The quirky eschatologist that you're looking for is René Girard, who he personally met at some point. For more details, check out the Behind the Bastards on him.

Edit: I wrote this before clicking on the LW post. This is a decent summary of Girard's claims as well as how they influence Thiel. I'm quoting West here in order to sneer at Thiel:

Unfortunately (?), Christian society does not let us sacrifice random scapegoats, so we are trapped in an ever-escalating cycle, with only poor substitutes like “cancelling celebrities on Twitter” to release pressure. Girard doesn’t know what to do about this.

Thiel knows what to do about this. After all, he funded Bollea v. Gawker. Instead of letting journalists cancel celebrities, why not cancel journalists instead? Then there's no longer any journalists to do any cancellation! Similarly, Thiel is confirmed to be a source of funding for Eric Weinstein and believed to fund Sabine Hossenfelder. Instead of letting scientists cancel religious beliefs, why not cancel scientists instead? By directing money through folks with existing social legitimacy, Thiel applies mimesis: pretend to be legitimate and you can shift what is legitimate.

In this context, Thiel fears the spectre of AGI because it can't be influenced by his normal approach to power, which is to hide anything that can be hidden and outspend everybody else talking in the open. After all, if AGI is truly to unify humanity, it must unify our moralities and cultures into a single uniformly-acceptable code of conduct. But the only acceptable unification for Thiel is the holistic catholic apostolic one-and-only forever-and-ever church of Jesus, and if AGI is against that then AGI is against Jesus himself.